Ore-roasting furnace.



PATBNTEDgg-PR. 11, 1905.

A. G. JOHNSON.

ORB'ROASTING PURNAGE.

APPLICATION FILED FEB. 4. 19,04.

v s SHEETS-SHEET ,2.

No. 786,905.l 'PATENTED APR. 11, 1905.

A; o. JOHNSON.

4 ORE ROASTING PURNAGE.. I APPLIUATON FILED FEB.4.`1904. y

s SHEETS-SHEET s.

Patented April 11, 1905.

PATENT l OFFICE.l

ALBERT o. JOHNSTON, oFLBALTiMonE, MARYLAND.

oRE-OASTING yFUFNAGE.

SPECIFICATION forming part of Lettersv Patent No. 786,905, dated. April 11, 1905.

' Application filed February 4,1904. Serial No. 191,973.

To all whom t Netty concern:

Be it known that I, ALBERT (l. JOHNSON, a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Ol'e- Roasting Furnaces; and I do declare the following to be a full, clear, and exact descripl tion of the invention, such as will enable others skilled in the artto which itfappertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to new and useful improvements in ore roasting furnaces and driers; and the object of. the invention isrr to generally improve upon the form of apparatus embodied in my Patent No. 715,080 and to render more eflicient this type of apparatus.

More specifically, the present invention consists in the provision of a rocking or tilting furnace of any suitable shape with a horizontal axis and provided with a series of inclined shelves or beds arranged alternately within the furnace or drier in such a manner that the ore or material to be dried which is deposited upon the upper shelf will Ymove from one side o f the shelf to the otherl asz the furnace or drier is tilted andA at the same time causing the ores or other material to advance toward the free end of the shelf as the rocking of the furnace is continued, whereby the ore or other material is caused to fall from shelf to shelf until it reaches the exit end of the furnace.

My invention consists, further, in various details of construction and in arrangements of parts, which will be-hereinafter fully described and then specifically defined in the appended claims.A

I illustrate my invention in the accompanying drawings, which, with the letters of reference marked thereon, form a part of this application, and in which drawings- Figure l is a sectional view through a portion of my improved ore-roasting furnace, parts of the invention being shown in elevation. Fig. 2 is an end view. Fig. Sis a transverse section on line 3 3 of Fig. 1. Fig.

4 is a side'elevation of my furnace, showing in dotted lines the projectionsor ribs for supporting the arch or lining. ,Fig 5 is a crosssectional view through Fig. 4.

Reference now being had to the details of the drawings by letter, A designates my irnproved furnace, which I have illustrated in the drawings as being cylindrical in shape, although I do not confine myself to any shape or size. B designatesheads to the furnace, which are strengthened and reinforced by means of buck-stays integral with the outer portions thereof. Said heads have flanges B', to which the cylindrical shell is fastened 'by means of bolts -One head of the furnace is provided with a shaft C, and to said shaft, which has a flange C', is fastened a pipe D, also having a iiange D', which is fastened to the liange C. Said pipe D has an upwardlyextending portion E, which is angled and communicates with the interior of the furnace intermediate the shelf H and the highest portion of .the shell; Through said pipe E,

which rocks with the furnace, gases are conveyed away from the furnace into the air or into towers or-chambers. In orderl` to give access to the pipe E, a cap E', is litted over the'lower end thereof, which may be easily removed when access is desired to clean out pipes or other purposes.

The heads of the furnace are provided with suitable openings, over which doors N are closed, through which apertures access may be had to the interior of the furnace for building up thesame, for repair, or other purposes, each being provided with asight-aperture, which may be closed by means of a small door. In order toregulate the ingress'of air to the furnace, slots or openings K are formed in the heads, which are regulated by means of slides K', held bysuitablecleats onthe opposite sides of said openings.l y

The interior of the furnace is provided with a suitable lining of tiling or brickwork Q, and is provided with a series of Shelves, (designated in the drawings by letters H, H', and H) which `are also made of tiling or brickwork and which are supported along the inner wall of the furnace upon the ribs or brackets J. (Shown clearly in Figs. 4 and 5 of the drawings.) Said ribs or brackets may be cast upon or bolted to the shell of the furnace and extend from end to end thereof and are disposed at suitable angles for the proper inclination of said shelves or beds. These ribs or brackets form the skews when brick arches are used and the supports when tiling are used. The shelves or beds, as will be observed in the drawings, are alternately inclined in opposite directions with their alternate ends free, and in Fig. 3 it will be observed that the shelves are formed on the arcs of circles the axes of which are at angles to one another and lengthwise of the furnace. The arrangement of the shelves in the manner illustrated is for the purpose of causing the ore being roasted to be carried from one end of the furnace or shelf to the other as the furnace is alternately rocked in one direction and the other, the ore being caused to travel from the inlet to the exit end of the furnace Without the use of any working parts, such as rakes, stirrers, &c., inside the furnace.

In the drawings I have illustrated three shelves or beds running from one head of the furnace to the other, with the exception of the intervening of slight spaces between the free end of a shelf and the adjacent end of the furnace, through which space the ore is allowed to fall from an upper shelf to one immediately below. I have also shown the shelves to be conveXed, as illustrated in the sectional view; but they may be flat, and adividing-wall in the center may be employed, if desired.

Projecting from one head of the furnace, opposite to that from which the gases make eXit, is a shaft G, which shaft, as well as the shaft C, is mounted in suitable bearings in the standards I, and projecting from said shaft G is-a rocking-arm GH, which is adjustably connected to a pitman R, which has pivotal connection with an eccentric -pin R, mounted upon the pinion-wheel R2. which is in mesh with a worm S, whereby power is applied to the pinion to rock the furnace through the medium of said arm. Surrounding the shell are metallic bands T, which ride upon the antifriction-rollers WV, mounted in suitable brackets underneath the furnace.

At any suitable location, preferably over the highest portion of the upper shelf, is located a hopper F, in which the ore is placed and from which it enters the furnace through the feeding-aperture F. (Shown in Fig. l of the drawings.)

The lowest shelf or bed H2 has an inclined exit passage-way H3, which has a door HA1 pivotally mounted adjacent to its end and which opens automatically for the discharge of the cinder.

The operation of my improved furnace is as follows: Having produced suilicient heat in the furnace by artificial means to ignite the material containing sulfur or other combustible material, the ore is introduced through the hopper and drops upon the upper shelf H. As the furnace tilts slightly in one direction, which would be across the line of the shelf or bed, the ore. would fall toward the side or eircumferenee of the furnace in the direction in which the latter is tilted, and as the bed or shelf is disposed at an angle the ore in the opposite tilting movement of the furnace would be caused to advance slightly toward the free end of the shelf H, down the inclined surface thereof. By repeating this back-and-forth rocking movement of the furnace it will be observed that the ore will gradually work oilI from the first shelf onto the second and thence will be caused to move the length of the furnace before reaching the free end of the shelf H, after which it will fall upon the shelf and finally will make exit through the passage H near the lowest portion of the bottom shelfor bed. By this movement of the furnace the ore is constantly kept in motion and advances gradually until it reaches the exit end of the furnace, by which time the ore will be thoroughly roasted.

While I have shown a particular form of roasting apparatus embodying the features of my invention, it will be understood that I may make alterations in the same in various ways as to the size of the furnace, arrangement of the shelves, &c., without in anyway departing from the spirit of the invention.

Then the apparatus is intended to be used as a drier orl for roasting very low'grade ores, it is provided with a fire-box t0 produce artificial heat.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A rocking ore-roasting furnace or drier having a series of shelves the upper surfaces of which are eonveXed, the axes of which shelves are at angles to one another and lengthwise of the furnace, the alternate ends of said shelves being free, and means for rocking the furnace, as set forth.

2. A horizontally -rotatable ore roasting furnace or drier having a series of shelves, the axes of which shelves are at inclinations to one another and lengthwise of the furnace, the alternate ends of said shelves being free, and means for rocking the furnace, as set forth.

3. A horizontally-rocking furnace or drier having a series of shelves the upper surfaces of which are eonveXed, the axes of which shelves are at angles to one another and lengthwise of the furnace, the alternate ends of the shelves being free, and means for rocking the furnace axially, as set forth.

IOO

IOS

4. Ahorizontally-rocking ore-roasting furthrough the Wall of the furnace, and means nace or drier having a series of shelves the upfor rocking the latter, as set forth. IO per surfaces of which are convexed, the axes [n testimony whereof I hereunto affix my of which shelves are at angles toone another signature in presence of two Witnesses.

and lengthwise of the furnace, thereby pro- ALBERT C. JOHNSON. viding series of shelves which are alternately Witnesses: inclined in opposite directions, an exit-tube ENooH HARLAN,

passing through the lower of said shelves and THOMAS BURLING HULL, Jr. 

